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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    package org.apache.commons.jxpath;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    import java.lang.reflect.Constructor;<a name="line.19"></a>
<FONT color="green">020</FONT>    import java.lang.reflect.Method;<a name="line.20"></a>
<FONT color="green">021</FONT>    import java.util.Collection;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.util.Collections;<a name="line.22"></a>
<FONT color="green">023</FONT>    import java.util.Iterator;<a name="line.23"></a>
<FONT color="green">024</FONT>    import java.util.Set;<a name="line.24"></a>
<FONT color="green">025</FONT>    <a name="line.25"></a>
<FONT color="green">026</FONT>    import org.apache.commons.jxpath.functions.ConstructorFunction;<a name="line.26"></a>
<FONT color="green">027</FONT>    import org.apache.commons.jxpath.functions.MethodFunction;<a name="line.27"></a>
<FONT color="green">028</FONT>    import org.apache.commons.jxpath.util.MethodLookupUtils;<a name="line.28"></a>
<FONT color="green">029</FONT>    import org.apache.commons.jxpath.util.TypeUtils;<a name="line.29"></a>
<FONT color="green">030</FONT>    <a name="line.30"></a>
<FONT color="green">031</FONT>    /**<a name="line.31"></a>
<FONT color="green">032</FONT>     * Extension functions provided by Java classes.  The class prefix specified<a name="line.32"></a>
<FONT color="green">033</FONT>     * in the constructor is used when a constructor or a static method is called.<a name="line.33"></a>
<FONT color="green">034</FONT>     * Usually, a class prefix is a package name (hence the name of this class).<a name="line.34"></a>
<FONT color="green">035</FONT>     *<a name="line.35"></a>
<FONT color="green">036</FONT>     * Let's say, we declared a PackageFunction like this:<a name="line.36"></a>
<FONT color="green">037</FONT>     * &lt;blockquote&gt;&lt;pre&gt;<a name="line.37"></a>
<FONT color="green">038</FONT>     *     new PackageFunctions("java.util.", "util")<a name="line.38"></a>
<FONT color="green">039</FONT>     * &lt;/pre&gt;&lt;/blockquote&gt;<a name="line.39"></a>
<FONT color="green">040</FONT>     *<a name="line.40"></a>
<FONT color="green">041</FONT>     * We can now use XPaths like:<a name="line.41"></a>
<FONT color="green">042</FONT>     * &lt;dl&gt;<a name="line.42"></a>
<FONT color="green">043</FONT>     *  &lt;dt&gt;&lt;code&gt;"util:Date.new()"&lt;/code&gt;&lt;/dt&gt;<a name="line.43"></a>
<FONT color="green">044</FONT>     *  &lt;dd&gt;Equivalent to &lt;code&gt;new java.util.Date()&lt;/code&gt;&lt;/dd&gt;<a name="line.44"></a>
<FONT color="green">045</FONT>     *  &lt;dt&gt;&lt;code&gt;"util:Collections.singleton('foo')"&lt;/code&gt;&lt;/dt&gt;<a name="line.45"></a>
<FONT color="green">046</FONT>     *  &lt;dd&gt;Equivalent to &lt;code&gt;java.util.Collections.singleton("foo")&lt;/code&gt;&lt;/dd&gt;<a name="line.46"></a>
<FONT color="green">047</FONT>     *  &lt;dt&gt;&lt;code&gt;"util:substring('foo', 1, 2)"&lt;/code&gt;&lt;/dt&gt;<a name="line.47"></a>
<FONT color="green">048</FONT>     *  &lt;dd&gt;Equivalent to &lt;code&gt;"foo".substring(1, 2)&lt;/code&gt;.  Note that in<a name="line.48"></a>
<FONT color="green">049</FONT>     *  this case, the class prefix is not used. JXPath does not check that<a name="line.49"></a>
<FONT color="green">050</FONT>     *  the first parameter of the function (the method target) is in fact<a name="line.50"></a>
<FONT color="green">051</FONT>     *  a member of the package described by this PackageFunctions object.&lt;/dd&gt;<a name="line.51"></a>
<FONT color="green">052</FONT>     * &lt;/dl&gt;<a name="line.52"></a>
<FONT color="green">053</FONT>     *<a name="line.53"></a>
<FONT color="green">054</FONT>     * &lt;p&gt;<a name="line.54"></a>
<FONT color="green">055</FONT>     * If the first argument of a method or constructor is {@link ExpressionContext},<a name="line.55"></a>
<FONT color="green">056</FONT>     * the expression context in which the function is evaluated is passed to<a name="line.56"></a>
<FONT color="green">057</FONT>     * the method.<a name="line.57"></a>
<FONT color="green">058</FONT>     * &lt;/p&gt;<a name="line.58"></a>
<FONT color="green">059</FONT>     * &lt;p&gt;<a name="line.59"></a>
<FONT color="green">060</FONT>     * There is one PackageFunctions object registered by default with each<a name="line.60"></a>
<FONT color="green">061</FONT>     * JXPathContext.  It does not have a namespace and uses no class prefix.<a name="line.61"></a>
<FONT color="green">062</FONT>     * The existence of this object allows us to use XPaths like:<a name="line.62"></a>
<FONT color="green">063</FONT>     * &lt;code&gt;"java.util.Date.new()"&lt;/code&gt; and &lt;code&gt;"length('foo')"&lt;/code&gt;<a name="line.63"></a>
<FONT color="green">064</FONT>     * without the explicit registration of any extension functions.<a name="line.64"></a>
<FONT color="green">065</FONT>     * &lt;/p&gt;<a name="line.65"></a>
<FONT color="green">066</FONT>     *<a name="line.66"></a>
<FONT color="green">067</FONT>     * @author Dmitri Plotnikov<a name="line.67"></a>
<FONT color="green">068</FONT>     * @version $Revision: 670727 $ $Date: 2008-06-23 15:10:38 -0500 (Mon, 23 Jun 2008) $<a name="line.68"></a>
<FONT color="green">069</FONT>     */<a name="line.69"></a>
<FONT color="green">070</FONT>    public class PackageFunctions implements Functions {<a name="line.70"></a>
<FONT color="green">071</FONT>        private String classPrefix;<a name="line.71"></a>
<FONT color="green">072</FONT>        private String namespace;<a name="line.72"></a>
<FONT color="green">073</FONT>        private static final Object[] EMPTY_ARRAY = new Object[0];<a name="line.73"></a>
<FONT color="green">074</FONT>    <a name="line.74"></a>
<FONT color="green">075</FONT>        /**<a name="line.75"></a>
<FONT color="green">076</FONT>         * Create a new PackageFunctions.<a name="line.76"></a>
<FONT color="green">077</FONT>         * @param classPrefix class prefix<a name="line.77"></a>
<FONT color="green">078</FONT>         * @param namespace namespace String<a name="line.78"></a>
<FONT color="green">079</FONT>         */<a name="line.79"></a>
<FONT color="green">080</FONT>        public PackageFunctions(String classPrefix, String namespace) {<a name="line.80"></a>
<FONT color="green">081</FONT>            this.classPrefix = classPrefix;<a name="line.81"></a>
<FONT color="green">082</FONT>            this.namespace = namespace;<a name="line.82"></a>
<FONT color="green">083</FONT>        }<a name="line.83"></a>
<FONT color="green">084</FONT>    <a name="line.84"></a>
<FONT color="green">085</FONT>        /**<a name="line.85"></a>
<FONT color="green">086</FONT>         * Returns the namespace specified in the constructor<a name="line.86"></a>
<FONT color="green">087</FONT>         * @return (singleton) namespace Set<a name="line.87"></a>
<FONT color="green">088</FONT>         */<a name="line.88"></a>
<FONT color="green">089</FONT>        public Set getUsedNamespaces() {<a name="line.89"></a>
<FONT color="green">090</FONT>            return Collections.singleton(namespace);<a name="line.90"></a>
<FONT color="green">091</FONT>        }<a name="line.91"></a>
<FONT color="green">092</FONT>    <a name="line.92"></a>
<FONT color="green">093</FONT>        /**<a name="line.93"></a>
<FONT color="green">094</FONT>         * Returns a {@link Function}, if found, for the specified namespace,<a name="line.94"></a>
<FONT color="green">095</FONT>         * name and parameter types.<a name="line.95"></a>
<FONT color="green">096</FONT>         * &lt;p&gt;<a name="line.96"></a>
<FONT color="green">097</FONT>         * @param  namespace - if it is not the same as specified in the<a name="line.97"></a>
<FONT color="green">098</FONT>         * construction, this method returns null<a name="line.98"></a>
<FONT color="green">099</FONT>         * @param name - name of the method, which can one these forms:<a name="line.99"></a>
<FONT color="green">100</FONT>         * &lt;ul&gt;<a name="line.100"></a>
<FONT color="green">101</FONT>         * &lt;li&gt;&lt;b&gt;methodname&lt;/b&gt;, if invoking a method on an object passed as the<a name="line.101"></a>
<FONT color="green">102</FONT>         * first parameter&lt;/li&gt;<a name="line.102"></a>
<FONT color="green">103</FONT>         * &lt;li&gt;&lt;b&gt;Classname.new&lt;/b&gt;, if looking for a constructor&lt;/li&gt;<a name="line.103"></a>
<FONT color="green">104</FONT>         * &lt;li&gt;&lt;b&gt;subpackage.subpackage.Classname.new&lt;/b&gt;, if looking for a<a name="line.104"></a>
<FONT color="green">105</FONT>         * constructor in a subpackage&lt;/li&gt;<a name="line.105"></a>
<FONT color="green">106</FONT>         * &lt;li&gt;&lt;b&gt;Classname.methodname&lt;/b&gt;, if looking for a static method&lt;/li&gt;<a name="line.106"></a>
<FONT color="green">107</FONT>         * &lt;li&gt;&lt;b&gt;subpackage.subpackage.Classname.methodname&lt;/b&gt;, if looking for a<a name="line.107"></a>
<FONT color="green">108</FONT>         * static method of a class in a subpackage&lt;/li&gt;<a name="line.108"></a>
<FONT color="green">109</FONT>         * &lt;/ul&gt;<a name="line.109"></a>
<FONT color="green">110</FONT>         * @param parameters Object[] of parameters<a name="line.110"></a>
<FONT color="green">111</FONT>         * @return a MethodFunction, a ConstructorFunction or null if no function<a name="line.111"></a>
<FONT color="green">112</FONT>         * is found<a name="line.112"></a>
<FONT color="green">113</FONT>         */<a name="line.113"></a>
<FONT color="green">114</FONT>        public Function getFunction(<a name="line.114"></a>
<FONT color="green">115</FONT>            String namespace,<a name="line.115"></a>
<FONT color="green">116</FONT>            String name,<a name="line.116"></a>
<FONT color="green">117</FONT>            Object[] parameters) {<a name="line.117"></a>
<FONT color="green">118</FONT>            if ((namespace == null &amp;&amp; this.namespace != null) //NOPMD<a name="line.118"></a>
<FONT color="green">119</FONT>                || (namespace != null &amp;&amp; !namespace.equals(this.namespace))) {<a name="line.119"></a>
<FONT color="green">120</FONT>                return null;<a name="line.120"></a>
<FONT color="green">121</FONT>            }<a name="line.121"></a>
<FONT color="green">122</FONT>    <a name="line.122"></a>
<FONT color="green">123</FONT>            if (parameters == null) {<a name="line.123"></a>
<FONT color="green">124</FONT>                parameters = EMPTY_ARRAY;<a name="line.124"></a>
<FONT color="green">125</FONT>            }<a name="line.125"></a>
<FONT color="green">126</FONT>    <a name="line.126"></a>
<FONT color="green">127</FONT>            if (parameters.length &gt;= 1) {<a name="line.127"></a>
<FONT color="green">128</FONT>                Object target = TypeUtils.convert(parameters[0], Object.class);<a name="line.128"></a>
<FONT color="green">129</FONT>                if (target != null) {<a name="line.129"></a>
<FONT color="green">130</FONT>                    Method method =<a name="line.130"></a>
<FONT color="green">131</FONT>                        MethodLookupUtils.lookupMethod(<a name="line.131"></a>
<FONT color="green">132</FONT>                            target.getClass(),<a name="line.132"></a>
<FONT color="green">133</FONT>                            name,<a name="line.133"></a>
<FONT color="green">134</FONT>                            parameters);<a name="line.134"></a>
<FONT color="green">135</FONT>                    if (method != null) {<a name="line.135"></a>
<FONT color="green">136</FONT>                        return new MethodFunction(method);<a name="line.136"></a>
<FONT color="green">137</FONT>                    }<a name="line.137"></a>
<FONT color="green">138</FONT>    <a name="line.138"></a>
<FONT color="green">139</FONT>                    if (target instanceof NodeSet) {<a name="line.139"></a>
<FONT color="green">140</FONT>                        target = ((NodeSet) target).getPointers();<a name="line.140"></a>
<FONT color="green">141</FONT>                    }<a name="line.141"></a>
<FONT color="green">142</FONT>    <a name="line.142"></a>
<FONT color="green">143</FONT>                    method =<a name="line.143"></a>
<FONT color="green">144</FONT>                        MethodLookupUtils.lookupMethod(<a name="line.144"></a>
<FONT color="green">145</FONT>                            target.getClass(),<a name="line.145"></a>
<FONT color="green">146</FONT>                            name,<a name="line.146"></a>
<FONT color="green">147</FONT>                            parameters);<a name="line.147"></a>
<FONT color="green">148</FONT>                    if (method != null) {<a name="line.148"></a>
<FONT color="green">149</FONT>                        return new MethodFunction(method);<a name="line.149"></a>
<FONT color="green">150</FONT>                    }<a name="line.150"></a>
<FONT color="green">151</FONT>    <a name="line.151"></a>
<FONT color="green">152</FONT>                    if (target instanceof Collection) {<a name="line.152"></a>
<FONT color="green">153</FONT>                        Iterator iter = ((Collection) target).iterator();<a name="line.153"></a>
<FONT color="green">154</FONT>                        if (iter.hasNext()) {<a name="line.154"></a>
<FONT color="green">155</FONT>                            target = iter.next();<a name="line.155"></a>
<FONT color="green">156</FONT>                            if (target instanceof Pointer) {<a name="line.156"></a>
<FONT color="green">157</FONT>                                target = ((Pointer) target).getValue();<a name="line.157"></a>
<FONT color="green">158</FONT>                            }<a name="line.158"></a>
<FONT color="green">159</FONT>                        }<a name="line.159"></a>
<FONT color="green">160</FONT>                        else {<a name="line.160"></a>
<FONT color="green">161</FONT>                            target = null;<a name="line.161"></a>
<FONT color="green">162</FONT>                        }<a name="line.162"></a>
<FONT color="green">163</FONT>                    }<a name="line.163"></a>
<FONT color="green">164</FONT>                }<a name="line.164"></a>
<FONT color="green">165</FONT>                if (target != null) {<a name="line.165"></a>
<FONT color="green">166</FONT>                    Method method =<a name="line.166"></a>
<FONT color="green">167</FONT>                        MethodLookupUtils.lookupMethod(<a name="line.167"></a>
<FONT color="green">168</FONT>                            target.getClass(),<a name="line.168"></a>
<FONT color="green">169</FONT>                            name,<a name="line.169"></a>
<FONT color="green">170</FONT>                            parameters);<a name="line.170"></a>
<FONT color="green">171</FONT>                    if (method != null) {<a name="line.171"></a>
<FONT color="green">172</FONT>                        return new MethodFunction(method);<a name="line.172"></a>
<FONT color="green">173</FONT>                    }<a name="line.173"></a>
<FONT color="green">174</FONT>                }<a name="line.174"></a>
<FONT color="green">175</FONT>            }<a name="line.175"></a>
<FONT color="green">176</FONT>    <a name="line.176"></a>
<FONT color="green">177</FONT>            String fullName = classPrefix + name;<a name="line.177"></a>
<FONT color="green">178</FONT>            int inx = fullName.lastIndexOf('.');<a name="line.178"></a>
<FONT color="green">179</FONT>            if (inx == -1) {<a name="line.179"></a>
<FONT color="green">180</FONT>                return null;<a name="line.180"></a>
<FONT color="green">181</FONT>            }<a name="line.181"></a>
<FONT color="green">182</FONT>    <a name="line.182"></a>
<FONT color="green">183</FONT>            String className = fullName.substring(0, inx);<a name="line.183"></a>
<FONT color="green">184</FONT>            String methodName = fullName.substring(inx + 1);<a name="line.184"></a>
<FONT color="green">185</FONT>    <a name="line.185"></a>
<FONT color="green">186</FONT>            Class functionClass;<a name="line.186"></a>
<FONT color="green">187</FONT>            try {<a name="line.187"></a>
<FONT color="green">188</FONT>                functionClass = Class.forName(className);<a name="line.188"></a>
<FONT color="green">189</FONT>            }<a name="line.189"></a>
<FONT color="green">190</FONT>            catch (ClassNotFoundException ex) {<a name="line.190"></a>
<FONT color="green">191</FONT>                throw new JXPathException(<a name="line.191"></a>
<FONT color="green">192</FONT>                    "Cannot invoke extension function "<a name="line.192"></a>
<FONT color="green">193</FONT>                        + (namespace != null ? namespace + ":" + name : name),<a name="line.193"></a>
<FONT color="green">194</FONT>                    ex);<a name="line.194"></a>
<FONT color="green">195</FONT>            }<a name="line.195"></a>
<FONT color="green">196</FONT>    <a name="line.196"></a>
<FONT color="green">197</FONT>            if (methodName.equals("new")) {<a name="line.197"></a>
<FONT color="green">198</FONT>                Constructor constructor =<a name="line.198"></a>
<FONT color="green">199</FONT>                    MethodLookupUtils.lookupConstructor(functionClass, parameters);<a name="line.199"></a>
<FONT color="green">200</FONT>                if (constructor != null) {<a name="line.200"></a>
<FONT color="green">201</FONT>                    return new ConstructorFunction(constructor);<a name="line.201"></a>
<FONT color="green">202</FONT>                }<a name="line.202"></a>
<FONT color="green">203</FONT>            }<a name="line.203"></a>
<FONT color="green">204</FONT>            else {<a name="line.204"></a>
<FONT color="green">205</FONT>                Method method =<a name="line.205"></a>
<FONT color="green">206</FONT>                    MethodLookupUtils.lookupStaticMethod(<a name="line.206"></a>
<FONT color="green">207</FONT>                        functionClass,<a name="line.207"></a>
<FONT color="green">208</FONT>                        methodName,<a name="line.208"></a>
<FONT color="green">209</FONT>                        parameters);<a name="line.209"></a>
<FONT color="green">210</FONT>                if (method != null) {<a name="line.210"></a>
<FONT color="green">211</FONT>                    return new MethodFunction(method);<a name="line.211"></a>
<FONT color="green">212</FONT>                }<a name="line.212"></a>
<FONT color="green">213</FONT>            }<a name="line.213"></a>
<FONT color="green">214</FONT>            return null;<a name="line.214"></a>
<FONT color="green">215</FONT>        }<a name="line.215"></a>
<FONT color="green">216</FONT>    }<a name="line.216"></a>




























































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